We have use a mineral called Buck Jam for a few years now and have had great luck with it. we mix it with corn and also just pour it on the ground.
a few pics
This Buck we call One Eye looked like this the first time we saw him this was before we even feed them any minerals.and the 2nd pic of him is the next year when we started useing Buck Jam.
and here are a few other bucks that we have gotten while useing Buck Jam
we call this one Bent Brow
and this one is Split Brow
and this one we just got a couple days ago behind my house
So Buck Jam has been a great product for us and i highly recomend it.
also we have a member on here named Monster Raxx and he sells a mineral that I am going to give a try, Ive heard nothing but great things about it.